Looking at the second chart with SHB and DT, it seems like--if I'm reading it right--FF14 has fallen back to pre WoW migration numbers. Only I imagine you have some refugees still here, and some of the old guard that dislikes the changes brought out by those refugees, hardcore raiders, etc, have jumped ship--but you also have a lot of refugees going back to WoW since the game's gotten good so all is forgiven with the scandal /s.

That's my read on it, at least. Similar to how WoW was at a low point during FF14's high point in SHB.